Currently, I'm calculating combined stress (bending + shear) of shaft for lifting beam based on ASME BTH-1-2017. However, according to the equation (4-10): Sc = √(S^2 + 3*T^2) ≤ Su/5, it results that Sc is too higher than Su/5 because the factor is = 5. While if I use von mises stress equation...